Measurement of properties and of the resistance to segregation in heavyweight, self-compacting barite concrete

D. Revuelta; A. Barona; D. Navarro

doi:10.3989/mc.2009.43907

Authors

D. Revuelta Instituto de Ciencias de la Construcción Eduardo Torroja – CSIC, Madrid
A. Barona Instituto de Ciencias de la Construcción Eduardo Torroja – CSIC, Madrid
D. Navarro Instituto de Ciencias de la Construcción Eduardo Torroja – CSIC, Madrid

DOI:

https://doi.org/10.3989/mc.2009.43907

Keywords:

workability, fresh concrete, superplasticizer, stability, heavyweight, self-compacting concrete

Abstract

Heavyweight concrete is used for shielding in structures requiring protection against radiation. The addition of superplasticizers to mixes yields workable, high density materials with low water/cement ratios. This paper discusses the results of adding a polycarboxylate-based superplasticizer to heavyweight barite concrete to obtain a self-compacting mix. The fresh properties were characterized with trials suitable for self-compacting concrete. Since the large differences in constituent densities make segregation a key issue in this type of concrete, a specific trial was designed to check for homogeneity. The flowability, passing ability and resistance to segregation findings showed that the product obtained was a self-compacting concrete.

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